Q: Fractions can be added and subtracted only if they're what fractions?

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We can only add or subtract fractions if they have the same denominators

Unlike fractions have denominators that are unequal, and therefore cannot be added or subtracted. If two fractions need to be added or subtracted they must first be converted to like fractions.

That simply means that the fractions have different denominators. Such fractions cannot be directly added, subtracted, or compared; you have to convert them to a common denominator first.

The denominator (bottom number) must be the same for all the fractions being added or subtracted together.

No because in order to subtract or add fractions the denominator of the fractions must be the same and if they are not then the lowest common denominator of the fractions must be found. Having subtracted or added the fractions then it may be possible to simplify the result.

Nothing actually happens. You are now in a position where the fractions may be added or subtracted more easily but that is all.

They both can be multiplied, added, subtracted, and divided.

LCD is the Lowest Common Denominator which is the lowest number into which the denominators of all the fractions will each divide exactly. Each of the fractions can then be converted to an equivalent fraction with the new denominator which then allows the fractions to be added and/or subtracted.

Because God made it so O.o

When the denominators of two or more fractions are the SAME, then they can be added or subtracted directly. An easy way is to multiply each denominator by the other (along with its corresponding numerator).

Fractions can only be added or subtracted if the denominators are the same. If the denominators are different, then the fractions need to be made into equivalent fractions with the same denominator. The new denominator can be found simply by multiplying the denominators together, but this can lead to some large fractions with which to work. A better new denominator is the lowest common multiple of (all the) denominators. (Once the new denominator is found, the fractions' new numerators are found by multiplying their current numerator by the new denominator divided by their current denominator to make their equivalent fractions with the new denominator.) Once all the fractions are converted into equivalent fractions with the new denominator then the fractions can be added or subtracted, with the result being simplified (if possible).

By finding the lowest common multiple of the fractions with different denomiators that need to be added or subtracted

Fractions and mixed numbers are numbers that can be added, multiplied, divided and subtracted. This is taught in math.

Yes providing you change the fractions into decimals or change the decimals into fractions

Before fractions can be subtracted or added, they must have the same denominators. Therefore, each of the denominator and numerator of a pair of dissimilar fractions should be multiplied by a number chosen so that the resulting fractions will have the same denominators. This is most readily accomplished by multiplying each fraction by the denominator of the other. Once the fractions have a common denominator, their numerators can be subtracted or added to obtain the proper value of the numerator of the sum or difference, which will have the common denominator thus determined. It may, of course, be possible to simplify the resulting fraction.

It is 50/200, which can be simplified but it can be worth waiting to see if there are other fractions to be added or subtracted.

fractions and decimals both represent parts of a # Can be divided, multiplied, added, and subtracted ways to define a ratio use to find a percent

The hcf is useful in reducing fractions to their lowest terms and the lcm is useful in finding the lowest common denominator of fractions that have different denominators that need to be added or subtracted.

It is 75/100, which can be simplified but it can be worth waiting to see if there are other fractions of a pound to be added or subtracted.

It is 4/100, which can be simplified but it can be worth waiting to see if there are other fractions of a pound to be added or subtracted.

It is 39/3600, which can be simplified but you may prefer to wait until you are sure there no other fractions of an hour to be added or subtracted.

That depends on what you want to do with them. Since fractions aren't equations, they don't need to be "solved." Sometimes they need to be reduced. To do that, find the GCF of the numerator and denominator and divide them both by it. If the GCF is 1, the fraction is in its simplest form. Sometimes unlike fractions need to be added and subtracted. To do that, find the LCM of the denominators and convert them to like fractions.

Mixed numbers can be converted to improper fractions. Improper fractions can be added the same way proper fractions are.

To add or subtract fractions the denominators must be the same - then the numerators are added or subtracted with the denominator being kept the same.When adding or subtracting fractions with different denominators, the fractions must first be converted into equivalent fractions with the same denominator and then the (new) numerators can be added or subtracted as required.For the denominator for these equivalent fractions, the original denominators can all be multiplied together, but this can lead to having to work with very large numbers; a better choice for the denominator is the smallest number that all the denominators divide into, their Least Common Multiple (LCM) - this is is then used as the denominator for the equivalent fractions and is called the Least Common Denominator (LCD) of the fractions.First you find the LCD okay??? Then you have to add or subtract. What they mean by that is that once you've found your lcd add or subtract..xx hope i helped :)

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.

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